@acciocat not being judgmental at all, and yes, what works for me is not right for everyone. But the op wanted to know what working parents do.
That said, the choice remains with every single parent, it's up to each one to find a strategy that suits them and their children, and that means NOT relying on government support or school to watch children while parents are at work.
School is school, it is what it is and the holidays won't change just because parents are working. And as a business, childminders and paid nurseries won't drop their rates just because they are charging the equivalent of one parent's monthly wage. They are in demand and can charge what they want.
So the decision rests with each parent, and at BASE level, that choice is 1. pay the bill, 2. change your job, 3. don't have kids.
OF COURSE, every family is different, some have extended families that will help (we didn't have that) and some with have close friends, (we didn't have that as we had moved to s new area). Some have split or blended families who can all chip in, and some - like us - just have no one and have to make changes to suit. But it's OUR responsibility as parents to do that, not the school, not the government.